Anatomy Which of the following is true regarding gastrulation? A Establishes all the three germ layers B Occurs at the caudal end of the embryo prior to its cephalic end C Involves the hypoblastic cells of inner cell mass D Usually occurs at 4 weeks 💡 Explanation Which of the following is true regarding gastrulation? ✓ Correct Answer: A. Establishes all the three germ layers